Add 4K more memory for HugeConsStringOutOfMemory test case

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/18068007

Patch from Haitao Feng <haitao.feng@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15472 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/test-api.cc

@@ -3784,7 +3784,7 @@ TEST(HugeConsStringOutOfMemory) {
   static const int K = 1024;
   v8::ResourceConstraints constraints;
   constraints.set_max_young_space_size(256 * K);
-  constraints.set_max_old_space_size(3 * K * K);
+  constraints.set_max_old_space_size(4 * K * K);
   v8::SetResourceConstraints(&constraints);
 
   // Execute a script that causes out of memory.